Hitachi Sj7002 Owners Manual

ModBus Mode Communications
Appendix B
B–28
When the Write Holding Register command cannot be executed normally, refer to the 
exception response.
Loopback Test [08h]:
This function checks a master-slave transmissi on using any test data. An example follows:
 Send test data to an inverter having slave ad dress “1” and receiving the test data from the 
inverter (as a loopback test).
The test subcode is for echo (00h,00h) only  and not available to the other commands.
Query:
Note 1:
Broadcasting is...

SJ7002 Inverter
Appendix B
B–29
Write in Coils [0Fh]:
This function writes data in consecutive coils. An example follows:
 Change the state of intelligent i nput terminal [1] to [6] of an inverter having a slave address 
“5.”
 This example assumes the intelligent input terminals have terminal states listed below.
When the Write in Coils command cannot be ex ecuted normally, see the exception response.
ItemData
Intelligent input terminal [1] [2] [3] [4] [5] [6]
Coil number 7 8 9 10 11 12
Terminal status...

ModBus Mode Communications
Appendix B
B–30
Write in Holding Registers [10h]:
This function writes data in consecutive holding registers. An example follows:
 Write “3000 seconds” as the first accelerati on time 1 (F002) in an inverter having a slave 
address “1.”
 This example uses change da ta “300000 (493E0h)” to set “3000 seconds” as the data 
resolution of the registers “1103h” and “1104h”  holding the first acceleration time 1 (F002) 
is 0.01 second.
When the Write Holding Register command ca nnot...

SJ7002 Inverter
Appendix B
B–31
Exception Response:
When sending a query (excluding a broadcasting query) to an inverter, the master always 
requests a response from the inverter. Usually, the inverter returns a response according to the 
query. However, when finding an error in the query, the inverter returns an exception response. 
The exception response consists of the fields shown below.
The content of each field is explained below. The function code of the exception response is the 
sum of the...

ModBus Mode Communications
Appendix B
B–32
Store New 
Register Data 
(ENTER 
Command)Neither the command (06h) to write data to a register nor the command (10h) to write data to 
multiple registers can store the updates they ma de in the internal memory of the inverter. 
Turning the inverter power off without storing the  updates deletes them and restores the original 
register settings. If you intend to  store register updates in the internal memory of the inverter, 
issue the Enter command as described...

SJ7002 Inverter
Appendix B
B–33
ModBus Data Listing
ModBus Coil ListThe following tables list the primary coils for the inverter interface to the network. The table 
legend is given below.
 Coil Number -  The network register address offset for the coil, in hex and decimal. Actual 
network address is 30001 + offset. The coil  data is a single bit (binary) value.
 Name -  The functional name of the coil
 R/W -  The read-only (R) or read-write (R/W ) access permitted to the inverter data
 Description -...

ModBus Data Listing
Appendix B
B–34
Note 1:ON usually when either the control circuit  terminal board or a coil is ON. Among 
intelligent input terminals, the control circuit terminal board is a high-priority termi-
nal. If the master cannot reset the coil ON st atus due to a transmission line break, turn 
ON and OFF the control circuit terminal  board to make the coil OFF status.
0018h 00024 AL - Alarm signal R 0 ... OFF
1 ... ON
0019h 00025 FA3 - Frequency arrival signal 
(set frequency or above) R...

SJ7002 Inverter
Appendix B
B–35
Note 2:The content of a transmission error is held  until the error is reset. (The error can be 
reset while the inverter is running.)
ModBus Holding 
RegistersThe following tables list the hold ing registers for the inverter interface to the network. The table 
legend is given below.
 Function Code -  The inverter’s reference code for  the parameter or function (same as 
inverter keypad display). Long-word values (3 2) bits are listed in two rows; “H” and “L” 
indicate...

ModBus Data Listing
Appendix B
B–36
D001 H Output frequency monitor R Real-time display of output frequency to motor, 
from 0.0 to 400.0 Hz1001h 04097 0 to 40000 0.01 Hz
D001 L R 1002h 04098
D002 — Output current monitor R Filte red display of output current 
to motor (100 mS  internal filter 
time constant) 1003h 04099 0 to 9999 0.01 A
D003 — Rotation direction monitor R 0 ... Stop 1...Forward
2...Reverse1004h 04100 0, 1, 2 —
D004 H Process variable (PV), PID  feedback monitor R Displays the scaled PID...

SJ7002 Inverter
Appendix B
B–37
D016 H Cumulative operation RUN time monitor R Displays total time the inverter 
has been in RUN mode in hours.
Range is 0 to 9999 / 1000 to 
9999/ 100 to 999 (10,000 to 
99,900) hrs. 1015h 04117 0 to 999900 0.1
D016 L R 1016h 04118
D017 
(high) H Cumulative power-on time 
monitor R Displays total time the inverter 
has had input power (ON) in 
hours. Range is:
 0 to 9999 / 100.0 to 999.9 / 
1000 to 9999 / 100 to 999 hrs. 1017h 04119 0 to 999900 1 hour
D017  (low) L
R...